Sets the style field of a `PangoFontDescription`.
The [[email protected]] enumeration describes whether the font is slanted and the manner in which it is slanted; it can be either pango_style_normal, pango_style_italic, or pango_style_oblique.
Most fonts will either have a italic style or an oblique style, but not both, and font matching in Pango will match italic specifications with oblique fonts and vice-versa if an exact match is not found.
| this |
a `PangoFontDescription` |
| style |
the style for the font description |